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<b>DbEnv::memp_trickle</b>
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<tt>
<b><pre>
#include &lt;db_cxx.h&gt;
<p>
int
DbEnv::memp_trickle(int percent, int *nwrotep);
</pre></b>
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<b>Description: DbEnv::memp_trickle</b>
<p>The DbEnv::memp_trickle method ensures that a specified percent of the pages
in the shared memory pool are clean, by writing dirty pages to their
backing files.</p>
<p>The purpose of the DbEnv::memp_trickle function is to enable a memory
pool manager to ensure that a page is always available for reading in new
information without having to wait for a write.</p>
<p>The DbEnv::memp_trickle method
either returns a non-zero error value
or throws an exception that encapsulates a non-zero error value on
failure, and returns 0 on success.
</p>
<b>Parameters</b> <br>
 <b>nwrotep</b><ul compact><li>The <b>nwrotep</b> parameter references memory into which
 the number of pages written to reach the specified
percentage is copied.</ul> 
 <b>percent</b><ul compact><li>The <b>percent</b> parameter is the percent of the pages in the cache
that should be clean.</ul>
<br>
<br><b>Errors</b>
<p>The DbEnv::memp_trickle method
may fail and throw
<a href="../api_cxx/except_class.html">DbException</a>,
encapsulating one of the following non-zero errors, or return one of
the following non-zero errors:</p>
<br>
<b>EINVAL</b><ul compact><li>An
invalid flag value or parameter was specified.</ul>
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<br><b>Class</b>
<a href="../api_cxx/env_class.html">DbEnv</a>, <a href="../api_cxx/mempfile_class.html">DbMpoolFile</a>
<br><b>See Also</b>
<a href="../api_cxx/memp_list.html">Memory Pools and Related Methods</a>
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